CN213583670U

CN213583670U - Shell sealing structure of circuit breaker

Info

Publication number: CN213583670U
Application number: CN202023223023.9U
Authority: CN
Inventors: 周敏琛; 马雄杰; 杨鸣霏
Original assignee: Changshu Switchgear Manufacturing Co Ltd
Current assignee: Changshu Switchgear Manufacturing Co Ltd
Priority date: 2020-12-28
Filing date: 2020-12-28
Publication date: 2021-06-29
Anticipated expiration: 2030-12-28

Abstract

A shell sealing structure of a circuit breaker belongs to the technical field of low voltage. The circuit breaker comprises a base and a bottom plate, wherein the base and the bottom plate are spliced with each other and jointly enclose to form an inner cavity, and a contact system of the circuit breaker is positioned in the inner cavity; a first partition wall is arranged on the base and between the adjacent contacts, and a first male clamping part is arranged on the first partition wall; a second phase partition wall is arranged on the bottom plate and between adjacent contacts, a first female clamping part is arranged on the second phase partition wall, and a first male clamping part is in clamping fit with the first female clamping part; the method is characterized in that: still include the sealing member, the sealing member is including being located the alternate sealing strip between first public joint portion and the first female joint portion. The advantages are that: the inter-phase short circuit phenomenon caused by diffusion of internal ionized gas to adjacent phases can be prevented when the circuit breaker is in breaking.

Description

Shell sealing structure of circuit breaker

Technical Field

The utility model belongs to the technical field of low-voltage apparatus, concretely relates to shell sealing structure of circuit breaker.

Background

The universal circuit breaker is mainly applied to an industrial low-voltage power system and is used for connecting and disconnecting current in a power grid circuit and protecting lines and power supply equipment from damage caused by faults of overload, undervoltage, short circuit, single-phase grounding and the like.

The breaking capacity is a main index for measuring the performance of the universal circuit breaker. Especially, when a strong current is broken, a large amount of high-temperature and high-pressure ionized gas is generated along with the burning of an electric arc, and if the gas cannot be rapidly cooled, compounded and dissociated in the phase, and leaks to an adjacent phase or the outside of a circuit breaker to be in contact with a grounding metal, the inter-phase and grounding short circuit fault is caused, the electric arc cannot be extinguished, and the breaking failure is caused.

In order to solve the problem, in the prior art, a base and a bottom plate of the circuit breaker are correspondingly provided with a convex rib and a groove, the convex rib and the groove are usually arranged between adjacent phases, and the movement path of ionized gas diffusion is blocked or prolonged through the matching of the convex rib and the groove, so that the risk of short circuit fault caused by the contact of gas between the adjacent phases due to diffusion movement is greatly reduced. However, because of unavoidable manufacturing errors of parts, seamless matching between the ribs and the grooves cannot be really realized, and especially under the design requirements of small phase spacing and high voltage breaking of products, how to avoid interphase contact and external diffusion of ionized gas and further improve the dielectric insulation performance of the products is a key problem to be solved urgently, and the structure in the prior art still has an improvement space.

As shown in fig. 1 and 2, the low-voltage circuit breaker structure in the prior art at least includes an operating mechanism 1, a base 2, a bottom plate 3, a movable contact system 4, and a stationary contact 5. The movable contact system 4 and the stationary contact 5 are housed in an internal space defined jointly by the base 2 and the bottom plate 3. The operating mechanism 1 is installed outside the base 2 and can drive the moving contact system 4 to contact or separate from the static contact 5, so that the circuit is switched on and off. The base 2 and the bottom plate 3 are internally and correspondingly provided with a first phase partition wall 21 and a second phase partition wall 31, the movable contacts 4 and the fixed contacts 5 of each phase are separated from each other by the first phase partition wall 21 and the second phase partition wall 31, and the first phase partition wall 21 and the second phase partition wall 31 are respectively and correspondingly provided with convex ribs and grooves which are matched with each other. When the breaker breaks short-circuit current, the paths of ionized gases diffusing to adjacent phases are prolonged due to the matching of the convex ribs and the grooves, so that short-circuit faults caused by the contact of the ionized gases in the adjacent phases are greatly reduced. However, for a breaker with high breaking requirement, such as a direct current breaker, a higher requirement is put on the air tightness between adjacent phases, and the problem of air tightness of a shell always troubles technicians.

In view of the above-mentioned prior art, there is a need for a reasonable improvement in the housing sealing structure of the existing circuit breaker. The applicant has therefore made an advantageous design, in the context of which the solution to be described below is made.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a shell sealing structure of circuit breaker, it can prevent when the circuit breaker divides absolutely that inside ionized gas from diffusing to adjacent looks and causing alternate short circuit phenomenon.

The utility model aims to solve the problems that the shell sealing structure of the circuit breaker comprises a base and a bottom plate, wherein the base and the bottom plate are spliced with each other and jointly enclose to form an inner cavity, and a contact system of the circuit breaker is positioned in the inner cavity; a first partition wall is arranged on the base and between the adjacent contacts, and a first male clamping part is arranged on the first partition wall; a second phase partition wall is arranged on the bottom plate and between adjacent contacts, a first female clamping part is arranged on the second phase partition wall, and the first male clamping part is in clamping fit with the first female clamping part; still include the sealing member, the sealing member include be located first public joint portion with first female joint portion between the alternate sealing strip.

In a specific embodiment of the present invention, the first male engaging portion is a rib, and the first female engaging portion is a groove.

In another specific embodiment of the present invention, the first male engaging portion is a groove, and the first female engaging portion is a rib.

In another specific embodiment of the present invention, the base is further provided with first side walls located at two sides, the bottom plate is further provided with second side walls located at two sides, the first side wall is provided with a second male engaging portion, and the second side wall is provided with a second female engaging portion; the second male clamping part is in clamping fit with the second female clamping part; the sealing element further comprises a side wall sealing strip positioned between the second male clamping part and the second female clamping part.

In another specific embodiment of the present invention, the base is further provided with a first bottom wall located at the bottom, the bottom plate is provided with a second bottom wall located at the bottom, the first bottom wall is provided with a third male clamping portion, the second bottom wall is provided with a third female clamping portion, and the third male clamping portion is in clamping fit with the third female clamping portion; the sealing element further comprises a bottom wall sealing strip positioned between the third male clamping part and the third female clamping part.

In still another specific embodiment of the present invention, the second male engaging portion is a rib, and the second female engaging portion is a groove.

In yet another specific embodiment of the present invention, the second male engaging portion is a groove, and the second female engaging portion is a rib.

In a more specific embodiment of the present invention, the third male engaging portion is a rib, and the third female engaging portion is a groove.

In yet another specific embodiment of the present invention, the third male engaging portion is a groove, and the third female engaging portion is a rib.

In a still more specific embodiment of the present invention, the sealing member is silicone rubber.

The utility model adopts the above structure, beneficial effect who has: firstly, as the interphase sealing strip is additionally arranged between the first male clamping part and the first female clamping part, the air tightness between the phases of the circuit breaker is further improved, the development requirement of the circuit breaker is met, and the interphase short circuit phenomenon caused by diffusion of internal ionized gas to the adjacent phases can be prevented when the circuit breaker is disconnected; secondly, as the side wall sealing strip is filled in the gap between the second male clamping part and the second female clamping part, the gas in the breaker is more difficult to be discharged outwards through the side wall of the shell, and the air tightness of the breaker is improved; thirdly, a gap between the third male clamping part and the third female clamping part is filled with a bottom wall sealing strip, so that gas in the breaker is discharged outwards through the bottom wall of the shell more difficultly, and the air tightness of the breaker is further improved.

Drawings

Fig. 1 is a perspective exploded view of a circuit breaker according to the prior art.

Fig. 2 is a perspective exploded view of the other side of the circuit breaker in the prior art.

Fig. 3 is a three-dimensional exploded view of one side of the middle circuit breaker of the present invention.

Fig. 4 is a three-dimensional exploded view of the other side of the middle circuit breaker of the present invention.

Fig. 5 is a schematic structural diagram of the base according to the present invention.

Fig. 6 is a schematic structural diagram of the bottom plate of the present invention.

Fig. 7 is a schematic structural view of the inter-phase sealing strip in the present invention.

Fig. 8 is a schematic structural diagram of the sealing member according to the present invention.

In the figure: 1. an operating mechanism; 2. the structure comprises a base, 21, a first partition wall, 211, a first male clamping part, 22, a first side wall, 221, a second male clamping part, 23, a first bottom wall, 231 and a third male clamping part; 3. a bottom plate, 31, a second partition wall, 311, a first female plug-in part, 32, a second side wall, 321, a second female snap-in part, 33, a second bottom wall, 331, a third female snap-in part; 4. a moving contact system; 4. a moving contact; 5. static contact; 6. the sealing element, 61, interphase sealing strip, 611, ring, 612, first straight strip, 613 step, 614, second straight strip, 615, opening part, 62, side wall sealing strip, 621, first end part, 622, connecting part, 623, second end part, 63, bottom wall sealing strip.

Detailed Description

The following detailed description of the embodiments of the present invention will be described with reference to the accompanying drawings, but the description of the embodiments by the applicant is not intended to limit the technical solutions, and any changes made according to the present invention rather than the essential changes should be considered as the protection scope of the present invention.

In the following description, any concept relating to the directions or orientations of up, down, left, right, front, and rear is based on the position shown in the corresponding drawings, and thus should not be construed as particularly limiting the technical solution provided by the present invention.

Referring to fig. 3 and 4, the circuit breaker includes an operating mechanism 1, a housing, and a contact system, where the contact system is located inside the housing, and the operating mechanism 1 is located at one side of the housing and can drive the contact system to operate.

The housing comprises a base 2 and a bottom plate 3 which are joined to each other and together enclose an inner space in which the contact system is located. The contact system comprises a moving contact 4 and a fixed contact 5, wherein the moving contact 4 is rotatably arranged on the base 2, and the fixed contact 5 is fixedly arranged on the bottom plate 3. The moving contact 4 is contacted with or separated from the static contact 5, so that the closing or separating operation of the contact system is realized.

Referring to fig. 5, a first partition wall 21, first side walls 22 at two sides, and a first bottom wall 23 at the bottom are disposed on the base 2 and between adjacent contacts, and an air outlet is disposed above the base 2, so that the base is not closed. The first partition wall 21 is provided with a first male locking portion 211, and the first male locking portion 211 may be a rib or a groove structure. The first sidewall 22 is also provided with a second male locking portion 221, and the second male locking portion 221 may be a rib or a groove structure. The first bottom wall 23 is also provided with a third male locking portion 231, and the third male locking portion 231 may be a rib or a groove structure.

Referring to fig. 6, a second partition wall 31, second side walls 32 at two sides, and a second bottom wall 33 at the bottom are disposed on the bottom plate 3 and between adjacent contacts, and an air outlet is disposed above the bottom plate 3, so that the bottom plate is not closed. The second partition walls 31 are provided with first female locking portions 311, and the first female locking portions 311 may have a rib or groove structure. The second sidewall 32 is also provided with a second female engaging portion 321, and the second female engaging portion 321 may be a rib or a groove structure. The second bottom wall 33 is also provided with a third female locking portion 331, and the third female locking portion 331 may be a rib or a groove structure.

With continued reference to fig. 5 and 6, when the base 2 and the bottom plate 3 are assembled, the first phase partition wall 21 and the second phase partition wall 31 form a partition wall between the internal phases of the housing. The first side wall 22 and the second side wall 32 form a side wall of the housing. The first bottom wall 23 and the second bottom wall 33 form a bottom wall of the housing.

The first male clamping part 211 is in clamping fit with the first female clamping part 311; the second male clamping part 221 is in clamping fit with the second female clamping part 321; the third male clamping portion 231 is in clamping fit with the third female clamping portion 331.

The male clamping part is matched with the female clamping part in a clamping manner, namely if the male clamping part is a convex rib, the female clamping part is a groove; if the male clamping part is a groove, the female clamping part is a convex rib.

Please refer to fig. 7 and 8, which are the technical points of the present invention: the housing of the circuit breaker further comprises a seal 6. The sealing member 6 includes a interphase sealing strip 61 located between the first male clamping portion 211 and the first female clamping portion 311, and the interphase sealing strip 61 may fill a gap between the first male clamping portion 211 and the first female clamping portion 311, so that airtightness between the phases of the circuit breaker is further improved. The development requirement of the circuit breaker is met.

The shape of the inter-phase sealing strip 61 should match with the gap between the first male clamping part 211 and the first female clamping part 311. Specifically, the interphase sealing strip 61 includes a ring portion 611, a first straight portion 612, a step portion 613, a second straight portion 614, and an opening portion 615. The ring part 611 is matched with the annular clearance; the first straight portion 612 and the second straight portion 614 are in clearance fit with the straight portions; the step part 613 is in clearance fit with the step surface; the aperture portion 615 is a clearance fit around the boss.

In order to further improve the airtightness of the circuit breaker, the circuit breaker internal gas is prevented from flowing out of the side walls and bottom wall of the case to the outside. The sealing member 6 further includes a sidewall sealing strip 62 located between the second male catching portion 221 and the second female catching portion 321. The sidewall sealing strip 62 can be filled in the gap between the second male clamping part 221 and the second female clamping part 321, so that the gas inside the circuit breaker is more difficult to be discharged outwards through the sidewall of the shell, and the air tightness of the circuit breaker is improved.

The shape of the sidewall seal 62 is matched with the gap between the second male fastening part 221 and the second female fastening part 321. Specifically, the sidewall sealing strip 62 includes a first end 621, a second end 623, and a connecting portion 622. The first end 621 is open-hole for fitting with a corresponding gap. And the second end 623 is likewise apertured for clearance fit around the boss. The connecting portion 622 is in the shape of a strip and connects the first end 621 and the second end 623.

The sealing member 6 further includes a bottom sealing strip 63 between the third male catching portion 231 and the third female catching portion 331. The bottom sealing strip 63 can be filled in the gap between the third male clamping part 231 and the third female clamping part 331, so that the gas in the breaker is more difficult to be discharged outwards through the bottom wall of the shell, and the air tightness of the breaker is improved.

The bottom wall sealing strip 63 is straight.

The sealing member 6 is made of elastic non-metallic material, preferably silicon rubber.

Claims

1. A shell sealing structure of a circuit breaker comprises a base (2) and a bottom plate (3), wherein the base (2) and the bottom plate (3) are mutually spliced and jointly enclose to form an inner cavity, and a contact system of the circuit breaker is positioned in the inner cavity; a first phase partition wall (21) is arranged on the base (2) and between adjacent contacts, and a first male clamping part (211) is arranged on the first phase partition wall (21); a second partition wall (31) is arranged on the bottom plate (3) and between adjacent contacts, a first female clamping part (311) is arranged on the second partition wall (31), and the first male clamping part (211) is in clamping fit with the first female clamping part (311); the method is characterized in that: still include sealing member (6), sealing member (6) including be located first public joint portion (211) with first female joint portion (311) between alternate sealing strip (61).

2. The housing sealing structure of a circuit breaker according to claim 1, wherein said first male catching portion (211) is a rib, and said first female catching portion (311) is a groove.

3. The housing sealing structure of a circuit breaker according to claim 1, wherein said first male catching portion (211) is a groove, and said first female catching portion (311) is a rib.

4. The housing sealing structure of the circuit breaker according to claim 1, wherein the base (2) is further provided with first side walls (22) positioned at two sides, the bottom plate (3) is further provided with second side walls (32) positioned at two sides, the first side walls (22) are provided with second male clamping portions (221), and the second side walls (32) are provided with second female clamping portions (321); the second male clamping part (221) is in clamping fit with the second female clamping part (321); the sealing element (6) further comprises a side wall sealing strip (62) positioned between the second male clamping part (221) and the second female clamping part (321).

5. The housing sealing structure of the circuit breaker according to claim 4, wherein the base (2) is further provided with a first bottom wall (23) located at the bottom, the bottom plate (3) is provided with a second bottom wall (33) located at the bottom, the first bottom wall (23) is provided with a third male clamping portion (231), the second bottom wall (33) is provided with a third female clamping portion (331), and the third male clamping portion (231) is in clamping fit with the third female clamping portion (331); the sealing element (6) further comprises a bottom wall sealing strip (63) positioned between the third male clamping part (231) and the third female clamping part (331).

6. The case sealing structure of the circuit breaker according to claim 4, wherein the second male catching portion (221) is a rib, and the second female catching portion (321) is a groove.

7. The case sealing structure of the circuit breaker according to claim 4, wherein the second male catching portion (221) is a groove, and the second female catching portion (321) is a rib.

8. The housing sealing structure of the circuit breaker according to claim 5, wherein the third male catching portion (231) is a rib, and the third female catching portion (331) is a groove.

9. The housing sealing structure of the circuit breaker according to claim 5, wherein the third male locking portion (231) is a groove, and the third female locking portion (331) is a rib.

10. The case sealing structure of circuit breaker according to claim 5, characterized in that said sealing member (6) is silicon rubber.